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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f2d25bd67e3ee0abc0d457fa5cab4635db77ad354d913e8e4cfb7b4468db121' 
  AND token = '8FsPxKOh7hZl4ThovEmfD3kb4yrOY1Y7T4B1XVF6u3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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