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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8b25d7e4129b285c52082a3438e905d244c7ac6fa97389a3e78be3e8d1f6c9a' 
  AND token = '7fjjGl9jip2cR1i11xzfMf0TmG9mAQwls5m+RWvtWOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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