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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7de385eae451a7559bf9f23364cc0073b3465b0085bea4b4bce5c9c85bfd0608' 
  AND token = 'Hf5LuUP2WPpPl6iis4MELfpVk3qPwSsgmqwLvEOC+aM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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