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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd5d0233bca4f4b5e4986c0607e413614dcc47df3fa56f5a7d18ca1cbe9100e2' 
  AND token = 'xR9ESmIbuJnoPrKOvlGOmWJQVstnrW0c3NFAfthcdQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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