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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8dee81fa3a042431861c7b53fce60e5a5f66ff946fc2053d4f9404cd24d088f' 
  AND token = 'ZRgpwDIqpAOwjYiDNblJxQx0wNdpIsKANSTdFSQZ+5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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