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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '234c37838a163522765ec3b88c8efb25f1c5373598514b3e0d7256c43794eeba' 
  AND token = 'o1X+YGc1EWuJ17IAkeHLl8rijdxq+foSv1qbZS9HxTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00126

JSON explain

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