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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a11a770a0406c5f261dfbab3f1c63e167c6ce6b172435d9cec46c48cd92fc4b' 
  AND token = 'KImov8Ipp2YcQG15SqtjrwrtHjSoCkau+4UiSo3p4cQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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