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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '018e242e15f188dbd0e3e574b85838b45902bb74798ff04625a0e8b99d1822ba' 
  AND token = 'L+loclNHSzSXxoxbY2ySYC8pl70ZEQi1q8BBAPuTqg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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