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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8efdff90d79e0821a2b424906f54c12af33c0064b6bd70cf3047f3bcbfa2dc7' 
  AND token = '5ugiCscB6A+QZ14HRx4hxV9PxTbg5+Apg6glJfRcSSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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