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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '019ad3cf03f5afeb461880b29184e91fd67305c2ccdaa234e55a4677b4443398' 
  AND token = 'Ip7NnXrVV+AFzb5MiFr6lCyaA0ZzqWWY4GXG1fT/oBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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