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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc30dfec5bf00ae5ae83d022f74ed3ec1b83c0145e6a17c1e811bca081e3a3ad' 
  AND token = 'l/t4kVeZpIDpbjGniRVsqjuhw4DdZ3KoXHVgL/4aPRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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