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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52a3675cfa84a2895105404d9b5e2d25c44ca6c90a08bc78ec8c6693b09f1be2' 
  AND token = '/qnd7PY0WM5/h8TXim6JJyb55EDAWBm3LqlwvIn/t/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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