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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29d2770724d4c28813245f4b4e6519336d821893c5f585e9e32a974fa9decbfd' 
  AND token = 'ur/bTI/8Y/Y6EADp30cY29groElUujtbtIEWnVAWpOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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