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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06d559db3026b0e61c8b8e19a748bf272e5bee3480b5a8e5022fa6d735cbb084' 
  AND token = 'hI7gecTnELduxr5jQBF6Nd2vh+vVgYLkgtewb6A0f8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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