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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c6cda84f9aba3bb589c3df1ad71164810503bda16c5e47dfca4272fe7d7ec7a' 
  AND token = 'RmJEfWf2LQnNzMdY70OTIw5Iycn0T4SCW1pOl4vDA4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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