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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41774c7d6f3ac3b4c5b0b72e225b486cabfc42f3d4cf5c401a0705b59d0059a0' 
  AND token = 'Eb5mUF4HNUD5Sinzi++HM+BuiPffS8UTNJbOco5CA9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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