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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ae762e0542fe126260dde7ebf6d5b412d7d559f93b81b22715085f35f133506' 
  AND token = 'bbW7+peLXUiHDNCzNe7sC8aBfqSa6MBEp9C2SzmC4Q0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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