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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b86d3ae9012fe0a3a1f08ab3e6a7dd7984b44b93b4cdfa3c1196e4f63b4aa054' 
  AND token = 'jqanp9OLO9autFJsVntVZ6M4RcQjOtyjk0CUCoFeaYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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