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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9b1ff0f3d2372fe6591114450a2fc724b9c17a5b6c760477f4bc661ba9ab61b' 
  AND token = 'YsQmoiO1dPy0Hcn7e00HSzZc/RX1o0ADd+QTbToF3dQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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