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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ae364477181c8c754ef26de595e183e2fed172dffb8f6f477308b9ebb2e032f' 
  AND token = 'QN+FccQ9dRVX58fbityzvGyMMlK8+rn94uPxKZKYE84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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