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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae158284a6ce8693d552d5899f624f8b9b405740cafb0abbe03ae58158d73eb7' 
  AND token = 'Mg/WHOZNSgrsnGA369yG8s49J5AMpMOZ6N25XuqMXzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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