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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcc0d54bdcda22efa6f372a89d556c0c0917d89a5d756b8dcd87c7a822e98e92' 
  AND token = 'S7Q0dSwlHY6Fq9Jz2P4a7NyE8sKXhltz3rIBC44nHz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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