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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7caa7c7155f5765214df689c8e512ca45590adaaac9f33d0b17cd73ae5b19bf' 
  AND token = 'J9ZMfBh2vlxG2M1QiS+GHJ6PgNm35arNJZdX87shiEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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