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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22e301dd1cf0daf9d134a9a09e3f59c13f048e28553571f22b37cdcf75b3fdc8' 
  AND token = 'yebLft5XJ9rwykwkAJBLG/kYjLw9UFD/5cMFBNIvInQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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