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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d720f49d37e216b79ccc7db204397149ff25816b87632a2498ae8bbc06c49bf' 
  AND token = 'RK3LKsp4x0yS0k74klccSaalH/lEU0HnW7J6hDDCkck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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