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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0760f2c34932d1d4b134b19de537a9ade240901955631057139dbce6e3d15f1d' 
  AND token = 'O9qIsIBOS1fBdq9imVl1CZkS7X5zeS83yMD/Ys9nJc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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