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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b09edfb46b7322eb50859e692a9b56f887d172e4778c5d38b15ce12decec928' 
  AND token = 'mHo9GEGBBg5ACbDiAfdMe0WtinC1gSq8FLpHLe9PvLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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