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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e84e227317418d77720aaf67cc7d0cac1fb2df01e6934ad915d1baedf0a4974' 
  AND token = 'koxhRG7ApM6qPqphiCZcO8ydSp3tzc16elqhmN2g2QM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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