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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb4b536b83be4a3ee7c3fde939032e8941e282c14efa0d52ad34e3888d1fdec1' 
  AND token = 'kK77ZN96m/kYE7SqZSxjPsvtn91BSNzbS0yBtaZJSro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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