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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82d7df8078971c98d1e84919aaa734e109e2a2d98d51f41c3e2c12b3d8b18618' 
  AND token = 'bf+GYoFQkRgPLnZ5rFZ09IIxjuxRvqR0rIFr7IMu6bk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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