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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '978b4a7c6fa2a82c0a4f230e8bd59fee689a6658541047750641a77ca483b1ee' 
  AND token = '7TylPXgBzMaAHxa/21gQaN5HnyeMdruBO2miIC4Ue6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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