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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd479d3a61f4c2aeeaa8a6f0dea8a91dae58d8c97fc49d4870c2c56f589b53cd2' 
  AND token = 'iCZYVY7D4/QkRiqViCUs4pxR0X900U1EzSf30vk2/8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00079

JSON explain

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