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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed819c7831e3b5d6017b7c5ceaa8ac124a66fe511c719fe0e6520554255b4060' 
  AND token = 'RCxQvXQ5Z9DJlNJthTLt2JhCORIcK1czPfDwU44VTxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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