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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31a32257ce8cf5746a2ac233e3ebd1401d425dfd4c10caf0bf94f3b39c520fed' 
  AND token = 'Y+RDNSuzmYtXEaYKVJjOxLN7YGEkNE6tH5mX3B0npkc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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