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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce7f1e1189d4792f448c97d9921a77b9b111e5fc42cb8c8c9c95845f74a8a244' 
  AND token = 'uOV8n3XtvudlqtF3XgZ9B1vf5Sze2t0qJyO0f75ffJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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