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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '205042f31ee252531ca6c84b377bad3fc3277a3557b1d32fbf1baad409554eb1' 
  AND token = '0S9HAVCIf0okOJjPf9AJ3zzuhfZBlO58hJMqzdtrJlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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