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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfb5b7cecb0483bd0d43484e3bff1b1c70a56bb5da21bc4e6cdca203cbb1a8fc' 
  AND token = 'MtvunRxbOuUSbuf7ZIrqZyBP16yDipTAxhK2Myhm3KM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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