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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '951ffd170c245fe0f13509433c75671dddcbc2e17c24d04be56cfaca01cb93c9' 
  AND token = 'uj5vqTh75bAwToyd2p0UADgQ+zaqmg+W9Hw8hPyNwOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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