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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4574905da65c50389bf0e860f59bbd17a9022794b52c1bc2489d19d9aa42e0c8' 
  AND token = 'j6CwvcSdWQGH83nWf/5JLDlm0LDDNX4CjLO+CMWlbQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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