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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bc54437b7a58da792972584caee13a3b0fa7b6dc5cce8ff2f5d7e96d67d484b' 
  AND token = 'BhLmCaTE5Il8mErx6K/rxu8yvLI6PNYcl72gVql1cT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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