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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbb73658c4d3ac275a5584c741db34ab9ef0b85ab52f7ac33204fca30dd00cb4' 
  AND token = '58dBaYKDZOFD8kpUJshpzxMIOfYw/7ID6yF4tQ3GJ4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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