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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '120acbc3747e4e93e2d418f4ac659247183cc9881bdc5b473c2d0588239d5315' 
  AND token = 'SPgX6/wacD/suTPgtG2ipwckpfJri/MZRBi2NGbC+hM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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