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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b7007c0d7b382ce24a49443575da1c5d22a7871964908409f6c34e2f63f13cc' 
  AND token = 'cveD22pp/6pQV/PoShMZCZb3XnHrAYKkZTXqjsdUApE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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