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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa537edc18648f69e3a6e162cbe5af06d87cf77c318a2c8ceb62e108209fb26b' 
  AND token = 'MPASZDFGhqNLJvA8S727ecOuZMgWzsPValyXN9vK02U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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