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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b01d3286c7d2519d6f6c622c9dcae2866ad6a9b31751e2729ad78876d4fde30' 
  AND token = 'scnbd6psSV6MGB17ilmkilEwpvgeOvB8+MuuM+kAVhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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