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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a4e7c14cb87eb2deaf9528952fa7f77805329500401d027e1ae1196bde595d3' 
  AND token = 'Rm4LjAe0c954k0W0onyVmumW9vOcmEKN43UuQbIIt+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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