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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d8eef2c2f3d8bde77119d0eed0c4c0be05df3660b95384a964b693be82cbec5' 
  AND token = 'hnttlW3hLP7OI98YDXMtpCj7q6ef54AdnuIqUAZvZ3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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