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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11fca8ef09f01108c3c00b79c636501b3f6e260ca91e8329640b847ab2550c98' 
  AND token = 'x8r32tX3pqjvNu+/KIdU/ZQbCe4Jf0shOU6TmHpDEPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}