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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3aac6d8f5ce56cb33c54549830d7f51dea2be6157325cdc1aeafe5fab14d0ca2' 
  AND token = 'p7PF484ZnMDNXw/WitBjoXndiXcuUKSlgQcsJft7dXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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