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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe6bcac38fa36f6a5f53f56af5d57f7db13bc9a23e4c55fe18f281a6ef8fd5b2' 
  AND token = '4kNw8aCrZHDY/FXUsz8bTCfR2fktfnhYm8d4w7rnn0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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