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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d61b179cd64c451ec236e1d5697a7aa7a7ed75b1ca0b1b0d5826ba40a4400e7' 
  AND token = 'NNj9yMDf7h5SGZAUjhdWsrORAf1nnj7N7RM7HkM0Dc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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