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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '272eb80375ce119b762d55d418d438f13125a82c7093f3fccaa177a9368c2697' 
  AND token = 'D5jodFIFl8HPuJcL48aQZHc96gej+ppLTweI8CrZ/HM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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