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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db00b7fdb6108b217ba4660919b48dfeab3d1d2ae92bb338c79f5067cd2361d8' 
  AND token = '6BUoECVjQBaUrLvUKY6RXsBcwN/dRWLqNxd0YTyA018=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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