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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8567b338eaf59a74eeb8f331c62da2bc3909a4797c175181a3e8769415301c6c' 
  AND token = 'YaIV1YF3LZth4a8hGxz30PK8+gZWKPt0TyFOPszFuTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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