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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0f5998ef787fe1191093ec6549de15688a596f03a044670278443433b19383d' 
  AND token = '8hCss4GCJd5VDnyYsVje/JH0QK0EzDb5THVlszqSFKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00077

JSON explain

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