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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38919c604e2af821d796bb60ec47af3edbeb71a42a440a8e53897aaad0fb482f' 
  AND token = 'm2vw7Ji5GfpY8etCwTF4tiYg5mFycvjlgdgci9ZY2FQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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