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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8b215d5a943af46146ce9d4557693eaa440b47cf54cf242068348134b77cf9b' 
  AND token = 'yMM4WJ1bfggp1mPZGygni+fMja98YpwmjcX7l6f3lIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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