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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fc1b099654d035a127b0b1affb794b16a8ef27af65904a7d08d2ab030e2c5d5' 
  AND token = 'oaZ//93uoSiPkA0GgQ6wp2MYApCktu7McEnjpzfZjU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00072

JSON explain

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