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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '344b3c162e3cac4cd13198bcb8663156e27919e5b7c05cdb777ccc74d47b1194' 
  AND token = 'L/I03pwXlYq5AdElgryJHZacM/jCRqeVN0qvob0Pf+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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