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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a3af9b3417be2b9935fb6e4532823d5ce85076c6ea179b148f823fd537c9d7e' 
  AND token = 'bsKKxRsLEAUlravhtXF7kuKuWdiv/MAIuzKAL6mF9Uo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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