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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5a4b1dd15f3fc2791b2c5e6b1d7b714da04e968c4e312b2e6ce7b15f3bb272b' 
  AND token = 'Nok4BWNDejQ8cTH74VzkguQuXl1gCHy7Ysz40IVxaBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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