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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb79b3d1ce3e736406acae043be3e4b8f7a90eed7f116b01f0180e7696d3dac9' 
  AND token = 'QHM52w4MW5dkLKpVAP0zB7dyJrKdI9vIOY81Q5SoY7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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