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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed47ea6b13bf35468cc5be12991b8c26b0fea114d5031f6a56782cb7d9435234' 
  AND token = 'iKgTHw/zxK2SDlg9yVbMNTTwysa6JhKLccLyC85MF7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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