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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4c44936628ce7a32eb05cedc1a5f59c248bcf9b7fcfbbc1783a6dfbf49a3aa7' 
  AND token = 'tlFTBTnve5egwCVZLIA5e/l7poxahZf7RQo1DbmD9OE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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