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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '573428f76e0ee8319c9ded09df7d3a3a05ae00b4b55130a79eefcb799e1e3960' 
  AND token = 'MygazGaZIDjExZPo38CwwIxYDmmxlQ62K06TC/fytg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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