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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd2c7a50e9d4e6b69902efa0d9af11b6e44b08a256d51a21775901de12c66bff' 
  AND token = 'RIFv45JaVFXkn9NBcs44zlFmX87CqRXA2enN7wzqlos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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